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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5370a4798204351e0c187401c2047400863f2fa44cd32ff4b7ebb4ea0d353487' 
  AND token = 'Kc1n/Pi4McxjxbnSa6rUKbHohE3Wsn28u8qn45WS6fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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