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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6372d3dc55bd70ffbd857daa4743a266f3bef607718a3b0716221e7026837b07' 
  AND token = 'xbhkZrr/JooVNEszsGmECIYNdkK9j3nYOR2csgrM0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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