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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb08c2b665d713f1c7a2f2f48bc75ee5685c12a7f5a94180de1ecd528b633cf' 
  AND token = 'a/cInz6m04DFUS6WL2NUon9o3ucGzbVRbrYG5A4lsyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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