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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c8de8dba58062fea8b47c3d99951d77c1015a79723b5ece4951dbedc3c8e7c' 
  AND token = 'VW/7SivcP2hJdq4+WwEzzv2i2vATe637t1XozkhcE30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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