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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51423e5e99ccbee7bdc0f42bc1f8e837d36b63d8cd49897114b553d8a4992069' 
  AND token = 'hCa16oea23J4vbusiet/cN2zqaLqx4HCVzCmyCt26b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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