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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaec9fb615215da9754e67621fd19ec2528edd62f8c81ac7682dbd8b4842cf4' 
  AND token = 'iMkI03kSU6GCdLQEwXuKktNp3R1I8wYHvoHyfWJ3nHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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