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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7bd81fcdce3c8fba2b5587bcb51adcc7962ea5c96529899eabb949a74351c1' 
  AND token = '3e8E0MieU2hV7iVayWvwzRYkOJchrFmecr8LIUrZgEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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