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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857d9d9bed59ca990828ae2883167b019fad47247f39fd3c2a0b96e7273816e4' 
  AND token = 'KLArre+ASRS95o+skOTkfEp3ObiB++z7TUM5oh85qzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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