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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843da234b764ed1dbf9e4b27ae120de53440e2c1dd3c980ca75c1e12acde92ba' 
  AND token = 'jCjkCOPsWxrkJ+3nB2mQA3EPCD28gwNT24STeR9KTM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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