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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a120ca9656c14226bba01805933ffccc82744646a7ec56c3db963c4285c7ba' 
  AND token = '+4hrFTS+fMf0ov+yN5LVerOq0H1zE1PGgTvqGgpA4NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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