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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a4497906c83fe94a3f661c117e3a2d93a55ad2d7c0131cb29734819796c5e3' 
  AND token = 'pYLloSEn6MO7ZZzPUKFovTSDjtXS1m4DF9hUeHjwVe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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