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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272da7af9f3a93c89a033ad4bc7d0122c2868a300acf8065682aef5aae1f3f8c' 
  AND token = 'THl77N93GJLuvGjdILQTDGvRy68v28QR9tfM2HFIVcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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