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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2159739bca9741d809475e87f99c180f6b2b731871dd156a911ce79c4cffd720' 
  AND token = 'hE0bZLCnMGyRyABI374MB/Og8WUS06mpFt7KUUnAOLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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