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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0410ae4a4ff3c7066d762eb3e6169281a0886a27d9f889e47be050a9fcf077' 
  AND token = 'JAS/QXemk82MaRlkM2+A/Ji3Q9o7B++iMb01BEi7sPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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