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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b60172606ea4e3795e0169418b922327c662811b153fe0ebf151b0e374e0928' 
  AND token = 'dfEuJFe0MEq8iZwiVseqWojpE5dhRc579XPlrrzkLR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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