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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf06c186f9bad5aadd217f2ce009dc0fa8a60b0251aa67e5f0439b8f7d90e3d' 
  AND token = 'MlKBx+fqttpl9gUJdfRPcJBabh7rAIjUbvmjhW3ujrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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