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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3834807d869650451cd8794706ed5391215153bf92c23375b3f88e42fcbedd7' 
  AND token = 'JGT8k39AcvJwafbb31Ly9HLAPNSgG+ZisS+7cmlqc5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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