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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a27bdf73544e288d1eb4048735b06dcb5296a3978ae141fc3fabbe845b0e0e' 
  AND token = 'sXHkCt1shkyHIWuX7/CrOOD9XJwZt7k24OICwJKCYKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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