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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da103ea01631f48a0eb09f9dced3afb586b5c969c02a2431ab44855e9ca99c8' 
  AND token = 'l0EVbJV85B7JgkqCi7rmcMsNOmDkO24FjNlOCcG+PhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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