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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba45e2e6ae43ad5e032ed27370efa895dcfbca2db6963fa2c193a1806ba7cfb' 
  AND token = 'soqWbBQysPo60oec6CA4vVNP9uQMCQ149GdTo41hDSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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