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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e72c6ad4a5bf3daebd75fcdf6ddba8cd66a6af3dc6b85bad67d151d5f4ad069' 
  AND token = 'MCn+LuUTokTRkG7sOV5Uhl4tuVF/F5+JPNe3cJ5FSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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