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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608689a08275a830680a70e09593a48073bcd763c49e2b4e6c73c36c3ad95487' 
  AND token = '+sMfSnBPg7oJHLbZ4iz17ACo1C0HWdLZBUUn0U9r+kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00398

JSON explain

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