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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c97c7db23945303802541b971aa273630271e62c91dc39260533dc950e639b0' 
  AND token = '0RTDUfcmVcmxKmMsevlqb3Tlf8IlKJ19WG2WGm8Wb+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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