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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a65b4631eaf61ceccf52a79183e8e483d0448672aad2519f52fb518f1acfb2' 
  AND token = 'F60rrYC7D1pfcudKVn8dPm7njeosbEsvtpfQCPsUNUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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