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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9fe1961de79dfd8a3a035f86eb75b45bba28e43a20218d5f754ea7c081c39e' 
  AND token = 'yOfYO6T8V3C0UrQ6ChYWdkgttm0S3dYNNuzN906/i+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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