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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4da0130c5d7df88db6dcc1833c4734e46ab91537e561156988f0db7151c96e0' 
  AND token = 'f+zBv1Vu9D1IO77kBgYm+HFlSeE+OeI+08R1MGnpUl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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