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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0beeb841d49289b71e97fdbcb9dfd5c776eff75a674aa2d3e1aa911a057543' 
  AND token = 'budutbzbukNOXd8946aAanH2XRmzBRhKq6Dp4mDL15Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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