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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fa9c61429983af081c49a06b9cccdf7b4ce0606ca67e84583436c0bb5cad2d' 
  AND token = 'S+pU2MW84bIicrgAtFaeAXRSSzPXmUz4bvM2AG4QygQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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