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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873d8ff27fe1b3d9e6a6e619c82cd3907efdc59388e5fba7a89b79af49ec50f8' 
  AND token = 'lEIXXvyt56rkoYNCwOK/PP3dMaaJhXgEeKh/TTAMdCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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