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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa454985d0e5899ceb0b2003ab763bf9edc3611c889da32c661f646cf468c9a' 
  AND token = '/p+6PtGHLIGtZegG3QBW4vgHnm8OoGndk8u8OzQ2DZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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