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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ca4953fa484b8cd2e87fee6dfa85772aa82cefd0eee7fd376c2ecca65fb53a' 
  AND token = 'BebhNWZDXrF6xwxnzxrgb813GVleFPGLF7LJmuRHgYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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