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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092f3a5f466a38ace41f818c18726164a01cf558647f6c18b809fb96b075b0db' 
  AND token = 'ScaZzi5bksvxgUmDSkQjCEqyIdYRX4chui4NlpRjZH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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