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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff0a4a00f60a47b7bd217ca43d8144f2c9d574348aaa89e2f3ab6e4b9064310' 
  AND token = 'Dml917GFLx83nIb55lb4j5kxmpBF5npdeetzogrf6wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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