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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110a83efa272609d7192502d4ffaed407116adfa0bb5e6aa35a88e77d5999437' 
  AND token = 'lHsxaTRyJH/WtQeMqoyw+VGihwsuxCMksCpj1PlL0MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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