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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00414cf0dae4a5e9c3a1cbb27e92f88f579b5a9dc8716faabf15c2eb7705f528' 
  AND token = '/rNH7MvwTdqdWk5nLCacBgR5y6JC6WcVt5w81vzcMlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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