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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69189ae4af03ffe256ac0846ff0ae9b2bb41a8a54333b5071793fe333a3e0c95' 
  AND token = 'pZv7QdSS2939wfJM8CcmAt+y5lLWlwyDonL+XEo0jFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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