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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981aa534623779abcf19de4ae49c20ffd1a153c9ddf9348a66df2666cac57696' 
  AND token = 'BoJAOlvH7PfPYCjIQ94u+ypDqHdX7tHErbLyfHQxTMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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