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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd358bd130857f5ff349a081ad4c0214f3a697a0b11ad9b8befde59e5cdbf0de8' 
  AND token = 'thGWlMPtC9YWyJUdumry7sx9K+Epb0v++Vs+JS8kXwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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