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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a3970052301ced7eb47934f33c9bdcb116da41327ae0bbdd22edba0977620e' 
  AND token = 'vArYgZPrwJ+I58ECtlY2Vb4Kc/dkxVYlmk62LAFQg1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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