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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87683589bf8df404a1ff7b57a01cd022d4d9c15b00bcc5917eb9e1a6dbcd03' 
  AND token = 'd3Y7uB5XHc9V/LvtcCRtufp6O/ffqzgqML1Ct35Yxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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