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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0178c64ba9c9b1cee22dbd8be1930ea984b045826da49b917f7005a4ee282fa' 
  AND token = 'Gtxg0/zad2kv7Ih0EbBlbsx9Gp5f702W92mdKZ2TFTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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