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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efed0479315e3e84ee777b84b7e1e86847a4f3e157228531d5827230af8c3d7' 
  AND token = 'L/GkG+T6IkzIwe5aTrA6UC9s13vK87UT6+Hv43efo9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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