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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb6c7e3bf25ae53db29ae0fecc4859ee26067516c7a09580513f4a96f5cc332' 
  AND token = 'M/8NBEOK0xhUI8pFVftwid0K5B1SwGwnrKOT9RBFU9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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