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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785e8c2f7848d9393a07de6e8a6b7d8270e1d80e230ef96c0fc21268ae97062c' 
  AND token = 'KrGxB9h+ZrS/uHQckNqUDcGvDh0g3sNIQ6AKICAc1I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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