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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb862d00887640c081bad0579ecc6c7056bd48d1ab18dba942236f23aaf85bd3' 
  AND token = '809xm0OMVtusDO8hEJJv/x6ah6AV4E9RojXPAes9r+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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