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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc98c0900f98ead5701a34e660fe64566944a0d076b4e39d7cb43ce9f21e53e' 
  AND token = '2upKcAc4Dkd0ESFXv5wYMZi0EW9m4NepJdmtsCieTpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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