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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0563ec2661460fef6fc141452ca5cee1344309aecbe82a92da9129c37c3fd975' 
  AND token = '0F8vT1MqWqgaiOfoV2DCdMYXNhw6bsKlBYRpF48bcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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