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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8daf19e33cb80397585f6a3cee57ce56a8ec42fb70916cec7b48c33f7a1403d6' 
  AND token = 'vMj1FNRBjUvVtnW7TNB4IlQT0sWTxZg1dk2wLrfdikg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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