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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da173266bcc4ab977a6bc8652fc51692e606164fff03cf220239d45ec1b333e2' 
  AND token = '9k3a5p4Qwut5DRjDcgU6ng/J4zOehSM5lC7eEIhun9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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