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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb09352fa6866b4510f7c5cc615b03c77a3ca608f79dedddebf76031b15c134' 
  AND token = 'vV284QuXOUgfa5DjvAw1IZuPN4Nxl7FLE7RflalZ/BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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