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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00b424f6468f6b46b8e9846e0b3371ccf43df4b79284090dcff0209a8adf417' 
  AND token = 'kyb4G2bBlMHvKpWpAAxVB7R0s1faKrQNc62zOZBpdj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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