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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd242fdb4a3abdf6d15de072600de1bc490167df458db09a629bf58249faf2a' 
  AND token = 'c42Ip6EkYLpUXtXI6WZmPJHu1aeLGnN2h0U5taRnNz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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