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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994b9ea2904a7767890cbd8625046df74a417fd9236516821471be507cf729a8' 
  AND token = '6ZveFLP/eFbehAwJ22fIq+2QL+h9Lc4Y3R8hPI0SznQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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