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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ea574ee784b7c840b2815d21e29c00467336de85be32ef3cefaa57a9a84638' 
  AND token = 'pF/bl+uK22lxOQCciOgT0baLLOqr3pI9Iow3bxHzE8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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