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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d978cbcba059f5707da346ad4d082cbea6a495db6ac4009e3fa1b84f7077e6' 
  AND token = 'Bj0P/u7kD53RQNSTa0RfFD30mIkgKycidjFI/14KzUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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