SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2f5a50eab164c6c931686dc3848be7690cf58c287afd6ad4515eac222ac9e6' 
  AND token = '7E/pwhzwX30p0RwUU7DAgrhYLrbgZG/8EoUL+DzUBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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