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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65db4036438e7bf4fd179ec46d49d3d519791d859b40d1722aaadafceedf961' 
  AND token = 'lRZhR1mG11LNTiw/uKjO/HEAd6ht2zQhiBFMyBLKddw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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