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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e920851136d21b16d4baedcb16d246c4f193fc8822c62c0d1b6769bb26c240f1' 
  AND token = '1J0pbWCNTy1K22KUKo9D8LaugrgwzFrdKa6z7tifboI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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