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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d492aaeda2f60ec1d0fd95355c12564b4295a854912fecf6702ec6a23a8a131' 
  AND token = 'N7EVx0/Auo2xsIaIYdtTE+dZidd/ZVJagP9g79/5wXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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