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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fced221c46714f5c1ecde72aec3cde723fa3b14405b2b21048020380496380' 
  AND token = 's9RIFkHwxycQCFuh0GZ7UcjEpA02ZzdmEe395Ac/Ox8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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