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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb29dc0c6f9cac5792ae8749a9d008aa58b173345b1c7ca44a5e75f1ee7fbee' 
  AND token = '1gHykz7256P5ewSQxv51IHJ1D9Xc4SfJL2xWhc4nQJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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