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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b307f1815360504dca02a2477489e50134470da714811f578894944b61557a3' 
  AND token = 'B5dAVhJYOjnkDddu1slbK2GPsC1FOIaZ2XbvQgt3XEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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