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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f9a743f4d9033109842d3f52cd1ff74bb4e6dc02312a9225549f307c50a5ff' 
  AND token = 'WPMj08Cn9bE8TrOM6ricAdsDy8jUeNXLxcHOvIpps1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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