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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b028247fc96ee404f9138a0fc372b3e9816cdbe3d2ac202c0825ea02d01a86a' 
  AND token = '+V7Ly+MazAFbqb21rfiael0qdj+WILbw64c7y1HHqWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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