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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c5580e3d616ef87f25086d64510234222f5bf64db9047963bd7bb66671a533' 
  AND token = '6MUtldKDY0SmteuaoLpD+nwilT+r/Eae7l2NC5CISWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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