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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85b13ff7d73accd427af79d84ffe0a394570b57abadc9e3b8e85e1c6171a66d' 
  AND token = '5Z9LGQcrk72jb5uMKaePtevBwX+aSsJyrhaW8XkUslc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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