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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5bbf340d90c096e8487d750b73acb6f4e554f06d94393e7caa4d45ba3c7a4c' 
  AND token = 'JNanBHx9+MFZTuj8eNZveqqwRgq9c+/z6Shi/LJbhhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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