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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870a6a6c3bcbd9f61f304c276b4166dc3df73c909b39c0bd35d072c33c68db14' 
  AND token = 'HActUdeD6yxkbs45rYDJ2t9CjWy41+H/eOZXB9DpYuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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