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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c5d6f1f0ad437bfd1d8b5a5b08a1ab9c25c49a13685f5581d843817932167f' 
  AND token = 'wRq4jJoyRW3qjUi7CyiXP+5QW9Y1b/dn8l43Ubbjd+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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