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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea06c1a9b8af68aab40693300e5c34ac0f150b2a9f047c8c3132ca95efae83a2' 
  AND token = '+PmVs6eqawFLktVuUgBnQo2GTY4E1pX+0kzuqpRa9fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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