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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8dde25e6abe7d2d3cef30bf907b94fedcf860ca5ae9856585241f696b19105' 
  AND token = 'cI7ZyIoabrsw3bdGbJS3u8GD4y+aTIG6A87p+0IMPug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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