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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe89af18cea23ba29ac66dc0ffe701fbd69c7b756e0403e6755a9bb94b915f5' 
  AND token = 'TRsjak7ZIXGD61zaRTGS8W97H1CmxMwAtvBWWN991Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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