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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5aa6e509add49002a76d4d86bfec742a7ef0e9fafbb2f8ed8f1d06095f2e390' 
  AND token = 'VCYb+ZO2vTJqNhyCAbyNynhyHQmzL2uujgiZ02u9q74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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