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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808c4b2a26f7b3caae66af6d7bc1c42f117a0b2a79744e5799f5e8d9299a7057' 
  AND token = 'daTVjibK/+K92TEkijrwx8I8ccst4ygnl+skd9CbEvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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