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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad01a21065adc2029d610f2255d68db233c488b168442159a75c8915b65f6178' 
  AND token = 'Cw3+VyL+nNJekK26BZ33Opq6BKuP634lGMuZ9aTTxTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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