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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2e1b2aa79f843cf7d356f7ddcdde7dd5b3b94c849910c310700097051a4959' 
  AND token = 'IDoa4BvQiytKyShpi5H9MZsqfulbYOq+LcgzhBN2aH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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