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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6954fa46e9004bc170eb4d582e9a075c7d31a0593bfc4da70de2428e40bebd4' 
  AND token = 'tDcM8cQmf2oVmbgLIRekr2Pia3XZU0JUM+0fh+aoQ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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