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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b816d458371b5acc06ba088757adf542768fd2df9a7fa7261feac8c55018dd4' 
  AND token = 'e5nqvf0waAsatNov7K9j9LJGi6dOWxJbEuATJfeU0Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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