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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc803b69fbccd43d0e3c4243e6d6ace3fc0011de1d0ae82779bd1fa74cc81475' 
  AND token = 'BGNZfZMArDLbYDZP8M6ZlkfKjHKMc+2D4+n5bRwhf8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}